20309970375677 has 2 divisors, whose sum is σ = 20309970375678. Its totient is φ = 20309970375676.

The previous prime is 20309970375649. The next prime is 20309970375697. The reversal of 20309970375677 is 77657307990302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13380129988996 + 6929840386681 = 3657886^2 + 2632459^2 .

It is a cyclic number.

It is not a de Polignac number, because 20309970375677 - 2⁶ = 20309970375613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20309970375697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10154985187838 + 10154985187839.

It is an arithmetic number, because the mean of its divisors is an integer number (10154985187839).

Almost surely, 2^{20309970375677} is an apocalyptic number.

It is an amenable number.

20309970375677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309970375677 is an equidigital number, since it uses as much as digits as its factorization.

20309970375677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105019740, while the sum is 65.

The spelling of 20309970375677 in words is "twenty trillion, three hundred nine billion, nine hundred seventy million, three hundred seventy-five thousand, six hundred seventy-seven".